ok. we cant tell you where to get roms. technically, they are illegal. just google it. second, make sure that your card is up to date. visit the acekard site for that. put the downloaded ds rom on your card, and place microsd card in your acekard. turn on ds, and when the menu comes up, chose the game that you downloaded. play as if you own the game. save as if you own it. if you have more than one game on yoru card, and dont want to reboot just to play another game, do a soft reset. i think its L + R + A + down. please correct me if im wrong. then just chose the game again, and it should start up as if it is still on the manufactures card. its all automatic. what it does is create a file that acts as a battery save. it is all automatic and very easy.